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        .box1{
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        .son{
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            background: yellow;
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    <div class="box1">box1</div>
    <div class="box2">
        <div class="son">son</div>
        <p>学并思</p>
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    <div class="box3">box3</div>
    <p>学并思</p>
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    <p>学并思</p>
    <p>学并思</p>
    <p>学并思</p>
    <p>学并思</p>
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